WATCH: GLEE cast previews all-new episode - 'Prom-asaurus'

GLEE: Tina (Jenna Ushkowitz, L), Santana (Naya Rivera, C) and Brittany (Heather Morris, R) perform in the "Prom-asaurus" episode of GLEE airing Tuesday, May 8 (8:00-9:00 PM) on FOX 50.

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By FOX50.com

Story Created: May 7, 2012 at 12:52 PM EDT

Story Updated: May 8, 2012 at 11:45 AM EDT

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Brittany goes into high gear as class president to spearhead the prom. Then, after prom king and queen nominations are announced, the kids kick into campaign mode, and some of the outcasts organize a rival celebration in the all-new “Prom-asaurus” episode of GLEE airing Tuesday, May 8 (8:00-9:00) on FOX. (GLE-319) (TV-14 D, L)

Cast: Matthew Morrison as Will Schuester; Jane Lynch as Sue Sylvester; Lea Michele as Rachel Berry; Cory Monteith as Finn Hudson; Jayma Mays as Emma Pillsbury; Dianna Agron as Quinn; Chris Colfer as Kurt; Kevin McHale as Artie; Amber Riley as Mercedes; Mark Salling as Puck; Jenna Ushkowitz as Tina; Naya Rivera as Santana Lopez; Heather Morris as Brittany; Harry Shum as Mike Chang and Darren Criss as Blaine Anderson.

Guest Cast: Chord Overstreet as Sam Evans; Lauren Potter as Becky Jackson; Iqbal Theba as Principal Figgins; Damian McGinty as Rory Flanagan; LaMarcus Tinker as Shane; Samuel Larsen as Joe Hart; Dot Marie Jones as Coach Beiste.